Add sk_deep_copy and its macro.

The next change imported from upstream needs this function.

Change-Id: I547efa1f7f46f0558e88047837a26ede32b19275

2 files changed, 31 insertions, 0 deletions

diff --git a/crypto/stack/make_macros.sh b/crypto/stack/make_macros.sh
index f72aa334..4837e449 100644
--- a/crypto/stack/make_macros.sh
+++ b/crypto/stack/make_macros.sh
@@ -86,6 +86,9 @@ output_stack () {
 #define sk_${type}_set_cmp_func(sk, comp)\\
   ((int (*) (const ${type} **a, const ${type} **b)) sk_set_cmp_func(CHECKED_CAST(_STACK*, STACK_OF(${type})*, sk), CHECKED_CAST(stack_cmp_func, int (*) (const ${type} **a, const ${type} **b), comp)))
 
+#define sk_${type}_deep_copy(sk, copy_func, free_func)\\
+((STACK_OF(${type})*) sk_deep_copy(CHECKED_CAST(const _STACK*, const STACK_OF(${type})*, sk), CHECKED_CAST(void* (*) (void*), ${ptrtype} (*) (${ptrtype}), copy_func), CHECKED_CAST(void (*) (void*), void (*) (${ptrtype}), free_func)))
+
 
 EOF
 }
diff --git a/crypto/stack/stack.c b/crypto/stack/stack.c
index 0b336ba4..c8332de4 100644
--- a/crypto/stack/stack.c
+++ b/crypto/stack/stack.c
@@ -360,3 +360,31 @@ stack_cmp_func sk_set_cmp_func(_STACK *sk, stack_cmp_func comp) {
 
   return old;
 }
+
+_STACK *sk_deep_copy(const _STACK *sk, void *(*copy_func)(void *),
+                     void (*free_func)(void *)) {
+  _STACK *ret = sk_dup(sk);
+  if (ret == NULL) {
+    return NULL;
+  }
+
+  size_t i;
+  for (i = 0; i < ret->num; i++) {
+    if (ret->data[i] == NULL) {
+      continue;
+    }
+    ret->data[i] = copy_func(ret->data[i]);
+    if (ret->data[i] == NULL) {
+      size_t j;
+      for (j = 0; j < i; j++) {
+        if (ret->data[j] != NULL) {
+          free_func(ret->data[j]);
+        }
+      }
+      sk_free(ret);
+      return NULL;
+    }
+  }
+
+  return ret;
+}